Mattermost versions 10.5.x <= 10.5.1, 10.4.x <= 10.4.3, 9.11.x <= 9.11.9 fail to check the "Allow Users to View Archived Channels" configuration when fetching channel metadata of a post from archived channels, which allows authenticated users to access such information when a channel is archived.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/mattermost/mattermost/server/v8(Go) | 10.5.0 | 10.5.2 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 10.4.0 | 10.4.4 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 9.11.0 | 9.11.10 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 0 | 8.0.0-20250314142426-c049748b8863 | N/A |
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